hello我想從java中產生gams我已經安裝了gams,這裏是代碼 gams是一個應用程序,我想從java調用它,我相信路徑是確切的,我應該怎麼做才能糾正它?這讓我異常 例外:錯誤線程「main」中的異常java.lang.NullPointerException
Exception in thread "main" java.lang.NullPointerException
at java.lang.ProcessBuilder.start(ProcessBuilder.java:441)
at java.lang.Runtime.exec(Runtime.java:593)
at java.lang.Runtime.exec(Runtime.java:466)
at gams.RunGAMS.main(RunGAMS.java:27)
Java Result: 1
這裏是我從this link改變
package gams;
import java.io.File;
import java.io.BufferedReader;
import java.io.InputStreamReader;
class RunGAMS {
public static void main(String[] args) {
System.out.println("Start");
String[] cmdArray = new String[5];
cmdArray[0] ="C:"+File.separator+"Program Files"+File.separator+"GAMS23.7" + File.separator +"gams.exe";
cmdArray[1] ="C:"+File.separator+"Documents and Settings"+File.separator+"Parsa"+File.separator+"My Documents"+File.separator+"gamsdir"+File.separator+"projdir" + File.separator +"trnsport.gms";
cmdArray[2] ="C:"+File.separator+"Documents and Settings"+File.separator+"Parsa"+File.separator+".nbi"+ File.separator+"tmp";
cmdArray[3] ="LO=3";
try {
Process p = Runtime.getRuntime().exec(cmdArray);
BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
String s = null;
while((s=stdInput.readLine()) !=null){
System.out.println(s);
}
p.waitFor();
}
catch (java.io.IOException e)
{
System.err.println(">>>>" + e.getMessage());
e.printStackTrace();
}
catch (InterruptedException e)
{
System.err.println(">>>>" + e.getMessage());
e.printStackTrace();
}
System.out.println("Done");
}
}
非常感謝你 – Nickool 2012-02-06 13:32:02